1 /* VMChannels.java --
2 Copyright (C) 2005 Free Software Foundation, Inc.
3
4 This file is part of GNU Classpath.
5
6 GNU Classpath is free software; you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 2, or (at your option)
9 any later version.
10
11 GNU Classpath is distributed in the hope that it will be useful, but
12 WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 General Public License for more details.
15
16 You should have received a copy of the GNU General Public License
17 along with GNU Classpath; see the file COPYING. If not, write to the
18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 02110-1301 USA.
20
21 Linking this library statically or dynamically with other modules is
22 making a combined work based on this library. Thus, the terms and
23 conditions of the GNU General Public License cover the whole
24 combination.
25
26 As a special exception, the copyright holders of this library give you
27 permission to link this library with independent modules to produce an
28 executable, regardless of the license terms of these independent
29 modules, and to copy and distribute the resulting executable under
30 terms of your choice, provided that you also meet, for each linked
31 independent module, the terms and conditions of the license of that
32 module. An independent module is a module which is not derived from
33 or based on this library. If you modify this library, you may extend
34 this exception to your version of the library, but you are not
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
37
38
39 package java.nio.channels;
40
41 import gnu.java.nio.ChannelInputStream;
42 import gnu.java.nio.ChannelOutputStream;
43 import gnu.java.nio.channels.FileChannelImpl;
44
45 import java.io.FileInputStream;
46 import java.io.FileOutputStream;
47 import java.io.InputStream;
48 import java.io.OutputStream;
49 import java.lang.reflect.Constructor;
50 import java.lang.reflect.InvocationTargetException;
51
52 final class VMChannels
53 {
54 /**
55 * This class isn't intended to be instantiated.
56 */
57 private VMChannels()
58 {
59 // Do nothing here.
60 }
61
62 private static Object createStream(Class streamClass, Channel ch)
63 {
64 try
65 {
66 Class[] argTypes = new Class[1];
67 argTypes[0] = FileChannelImpl.class;
68 Constructor constructor =
69 streamClass.getDeclaredConstructor(argTypes);
70 constructor.setAccessible(true);
71 Object[] args = new Object[1];
72 args[0] = ch;
73 return constructor.newInstance(args);
74 }
75 catch (IllegalAccessException e)
76 {
77 // Ignored.
78 }
79 catch (InstantiationException e)
80 {
81 // Ignored.
82 }
83 catch (InvocationTargetException e)
84 {
85 // Ignored.
86 }
87 catch (NoSuchMethodException e)
88 {
89 // Ignored.
90 }
91
92 return null;
93 }
94
95 /**
96 * Constructs a stream that reads bytes from the given channel.
97 */
98 static InputStream newInputStream(ReadableByteChannel ch)
99 {
100 if (ch instanceof FileChannelImpl)
101 return (FileInputStream) createStream(FileInputStream.class, ch);
102
103 return new ChannelInputStream(ch);
104 }
105
106 /**
107 * Constructs a stream that writes bytes to the given channel.
108 */
109 static OutputStream newOutputStream(WritableByteChannel ch)
110 {
111 if (ch instanceof FileChannelImpl)
112 return (FileOutputStream) createStream(FileOutputStream.class, ch);
113
114 return new ChannelOutputStream(ch);
115 }
116 }
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